found: German Wikipedia, viewed May 7, 2013(Ludwig Gumplowicz, Ludwig Gumplowitsch, Ludwik Gumplowicz; b. 9. March 1838 in the Free City of Kraków; d. 19. Aug. 1909 in Graz, Austria; lawyer and professor of constitutional and administrative law at the University of Graz; a founder of European sociology) {http://de.wikipedia.org/wiki/Ludwig_Gumplowicz}